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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937ba97c2d00dfef6ffa562b25ceb39adcf9110cb535f5b49757fd8a74243d04' 
  AND token = 'Hzz+8OettdEWEhMOfl/D8unpT6ZdTpZ/d7H/dZOyBXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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