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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3933df9d5ad9c30111476361680fa4b6e9f38d5ee91618e6a5cf864bc296e79' 
  AND token = 'sZTI2C2GCXWD8CG6mgA0Jk7SQyGvHwkf9K0PMlQ03pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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