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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f6aaac241f273db6aeb87c04c8668e41f15e9e6b29a64823e5e53a872688d8' 
  AND token = '3LaizxD1y5Giz7zEoF4jpNgi4lsgSLe9Gh8eC5VtBdo=' 
  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"
    }
  }
}