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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2345fdecf74adce45f341df05f2ea3868dc059e0eb95e403393e17bd204eab' 
  AND token = 'L+FIH3dOlILBpnPae8yp4RnU1Dp+Mw0PxkYaUQLCLVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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