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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2111247c470b0f8b3760b05c6321bfe02ae420e4bda9106b135b569cbd470f0a' 
  AND token = 'ElazyC133wmLrLl5pJxiEB4bVUiWaBMsjdCuBGYyYBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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