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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebda66193bd24b04cc31869348809c9fd3a226fabd7c56d9662c9542d071af9' 
  AND token = 'TCIA8jNzq0l6OabS3IlYA3V1taZFkWGlknDbYtVy6s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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