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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192bbc14fc16dca317d86810c9d496330e3a938c6c83415f14b6f5c13505fbe5' 
  AND token = 'Z0WAZfqS8bK5pp0YUMBllY/ntIOAL3D4RUVxljAPP1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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