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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12d6562e6b0d78916081a5962c4c1854f6327f767ad1b4debbc360e26a988fa' 
  AND token = 'N3yUWnIWYHoxvIsnEwmktqZbNSJx03Dgqqb4Qsqa3tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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