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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b4c2ea5fd73c3689f083398f8a805392175a92fc30dd3fbc143c741fe5e694' 
  AND token = '3fG9afaeoawk1ZtYrOklO+KAvrGzVPs+BF5ROXCGv9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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