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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a84d61e59e445de63749b594b3e1da77958eeb7bc563b1543948413c44d95cb' 
  AND token = '+0YWYLUevnOUxGQKOpEFKpIc9LY+5j8c9N2yq/XhD3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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