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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8982f05190b3abf76d8d46f3003c355619fed256900424a1c0f1b2cd55d5915' 
  AND token = 'lpSTAV/CBf6xODsBeK8gzMsAWV7no615nikuVOllMLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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