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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db27730b94bce4ba0254a7cf967e09260356cd4d974918619a7432df269b990' 
  AND token = 'Tg52HKsnsOWsYolU3aBZlIDrD24lAQ/E5jHTY3Q4Q7I=' 
  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"
    }
  }
}