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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2832529ae1d071fa02535a9bf61fdd4d132e6e97f670cc2eeeb888b6e0c96683' 
  AND token = 'kRg0yUXmoD+qJ5suBJeTbRvoW1ABwjKrGqNQkrb5MNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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