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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d95d06f0a77760a88f5e05360e62a3694089c3a8f91d43efce4e6d2aeddcec7' 
  AND token = 'qrPTFmkx8qeHeT8MYx+TJH22u5sM1fq4lOdXvoEEw7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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