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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dbb23937b9b55cf9d6b83b9190ca45fc7df9e5380997d1ecbda4eba5e50294' 
  AND token = 'RC1pRNaByHHVj4whCwA5nkFAjgU+K0RQLidpWAGhrI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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