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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6999be93caa32b13d53c1c865d13b930cf65299c5302ecfa9223f8c31d538c' 
  AND token = 'yFXM7aknrJfhYkru1ORpuWHn1ZsbpN8xPaohnd2UtFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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