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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff3523e9481442e528eab866f1e6da508d8fc71ba011ecbfa09c2e46b085b36' 
  AND token = '/InLgWxxK9Tt9dgQswT2edVqJurD3HLe9AlWAsvhlqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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