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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f05505da640a74c5f44b175f24bdd7a40850a9d639f6971cc11f27065369a9a' 
  AND token = 'oBgk2Ox1kcS+CtVPo1RppNt6t3x2IcUXkBB+QQktYLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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