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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c30f0618ad9ed8a257a56ee49b505a883d521bd3b4183c815bb4ae46bb8e60e' 
  AND token = 'l4lyT3SjZnLNFqfXuTXGMH1gxDCYJE0Lc0/FYeMCS9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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