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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31cddbaf2cd5379ac7828fe2be10fe5cb3f565365ff20c76ac9c62e489b3b44' 
  AND token = 'oJZHAV7Bb8AUS19NaYpxEnv71jx196gEsMnFM9enG8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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