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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa38a1d973cf76efeda4f8aaf747d517b9b0e7ad0db0a60c22438d275f520d5' 
  AND token = 'dY3zhKcxS/mBdm9s45g9NPexf134Qr7VxyUCig7+79Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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