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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acf1a8b4b39b1a260a95419e5f23c6cc506e0f973adf0fb053d70ef95893f7b' 
  AND token = 'y8OuyRSFX7P4yeEbFqfPi/MgHKyikl0DGdA7IbzhE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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