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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65f9841491e8c2c6998f46b8d74ec8811b6f75077088568b7eef134ccd06947' 
  AND token = 'bapqMMGAMf4zxfWhyHicy+Kq/s4SsUV976oX6ZaEuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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