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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c214349ad47b6850912304ef4dec23dcdc7bd270471e7d93a47801aa683208' 
  AND token = 'klvGDR4rNyuRkmjb9Iwt8qtAM05dwn7H7HFuV3A1Hn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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