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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6964122587a9329ce16947bafef6a35e6962fa9e00682f5f60bb29c3886e97b' 
  AND token = 'Yuoy/8Cj+D99s6zUU8pDlq2IKuQ+M3ht56E4R0OaqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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