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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d2da45a4c0e1228d0aa72d9712b7eef809787ffcbaa437ab5d37b05f6ed234' 
  AND token = 'OGJyE2PtFVmy4R+fv3SoyJh3atedU/s6aRBe/M4GvW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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