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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9e3e0a8b1ac7610928e60bedbb2d52ec6d70205169339260442b8393711e39' 
  AND token = 'eZslovf4eswdcgLq4kCSiUGVNaDwuHyMd2S9OGCZUmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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