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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d19efc96bb8df47a79bc6a579956717cb4f150210630bce8ac976287bcf6d0d' 
  AND token = '2t5LUsENYNsmA1qcHfQnJiLrBqwYpj3QWoNIsLXreQs=' 
  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"
    }
  }
}