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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e507929036f0645057db880a787176afd934ec8f0e8be8eeea2b645ce1054e6' 
  AND token = '04vER0lYrLfSbARK+3z1GRJAsk9hzWsnNtRffDm9lOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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