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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fdfd7e4ce5784418b14f75bc38461b9d36fb19596cc8de579064b6f233f6ac' 
  AND token = '4AwetM+mtnENtMb4ctf137ap3NrC3Dclax9i2VXKS3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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