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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728975389969c650f5392dd6c06957db8bf24fd40f1742d04759da6988e5f05b' 
  AND token = 'o6eH4I4eH3wc7hXHLCqMucPe+PT2QbOB1stvXVqO4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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