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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae8dbad1f336bba3f3db34aab9c48564edb68575de9856d1f0815e4003b59f9' 
  AND token = '3/MC+UUUSgScnXCLgcD73wTrRJd4SjjN5P9zL2ZWVSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}