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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea0e6b55960b2c331b17c13e58e9ec8bafb42c976891dedacc51a63ee67b691' 
  AND token = 'k/AAY4eWxlQkyWfcGps/3rWNhmj8ToDjk40K426vLYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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