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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df95a66aa5bfd70539e75acde711a581256080c6067a787c2395903ebe47a64a' 
  AND token = 'GDSIJW3XPDE+ujBe3xFCYSj56Ejs1ot68yL0u3DE3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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