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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa7030630c92a576c4dd18dac0402368e2c0500208cb35350669f3c7514f0c7' 
  AND token = 'fTz34OMaIKnPZuqveyliGad2cjiHgvL+HeS2M1VvonY=' 
  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"
    }
  }
}