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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ce243f87440776d5fad3793876c7ae244923f0997a2b761ed97565a094cb23' 
  AND token = '4J37wJ2RaHVpyygsCa75yumSEf8lxuIBgis4s1LCZvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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