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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3835a534a0e4f3e34d6fa280cd2244642162af900360fe33f7f68ec5439b9a8' 
  AND token = 'z9f9NZvTJ2t2SKPMcn84DsJNw+oPGtO2U+irQ5zD6c0=' 
  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"
    }
  }
}