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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92e9e22a99d4700f0de5f2507d8bc71d5c6f1ac029d8cc9c1ae6ee8ff01fb71' 
  AND token = 'mfgkd1PbLsJ3sGSfMK8EjceVFuqits/rO2DSzntFf+o=' 
  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"
    }
  }
}