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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4552fe2a2ff06996c1f564b4c9b7d7203b91fdfdab7ac567aab17b35e493ae9' 
  AND token = 'Z9B/FKzlCs7ttLDzV3GL9Nd1uNlXN4E1Qri0aX/9bw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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