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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2037598984a350ed4520454e0f301adae305f4f6c219e08ec661c59902a2be' 
  AND token = '3IkI+qOiKlxCBtUL22LQypt9kwpjg/WAAu4M45R/laA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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