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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0554d635702f9d37bd5ba2ce48be7a037882fea0fceeeda0669cf18ede6096' 
  AND token = 'WWetYxROO6D+hR6X4V5qEhPin682X4JdYQOaqlyUo74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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