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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386db6ff8a4720db7dc7bd12402f9f4390f303105dc9df6f3ea3cc4c5e1855d1' 
  AND token = '4f3+BHdExY2lWJSL7JIGSEAlXWVftIu62/E+EJlRNJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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