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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc11b3eb457c7297541d598cfea814b67b773d079563ea01a4b7ac0f4c75b2b6' 
  AND token = '3bTRS1GxchhLIKeBc4yXlsFA+aJC45N9hA8gmESZHDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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