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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9e21e1f0dbd9d9d4cf47c3ec7cb892d44a756d11df1a5d1095b5d7ce91f95e' 
  AND token = '+q98v0ckx11p86VRPc1gPEAW5Mpp9UXgrMao4SD5zwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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