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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7795241ebb4c06c2bae0f1b0731d515d805948e4e9e847c3c6816eef478b1de' 
  AND token = 'epPJ/I80nSb1Hd06W40wertAmCsSsqsaMGCfsMsW+HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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