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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317ca3927594eae404f8695076b598d534aca5e675fa7b4a7260a462e506e181' 
  AND token = 'vwvBFW7eFW3cZIAIX6C/Q8QTZFBFgBHQuiq+gNNy2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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