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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e72e873f66c9d713ffde1483dd7988cfec0200a07f80d67eb1d3daee1a83dd' 
  AND token = 's98Fzfei35o9amGv/hmNrbul3AORwn1NVxNrx2jea8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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