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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caecb8b20ba1abef3ee31f113615ea052576c004f8faba5f84f931e4ce35e7f1' 
  AND token = 'wTRvUXD7B8B09YUba6QXMM6XPk7qhbriuNpRA4fNxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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