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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db83e8b26bc76578810b3d3584cb7857e6ee7115e6fc37d029c31020910013b' 
  AND token = '7NXwgC68tFol8bw6Dl6ZM6yym1fNMu+dBNGD89VxqQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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