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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f377d36af93eccf5691c9081c765714b1845ba58e1978ec382f28c74ffd493f' 
  AND token = '3z2RLMqrl7XwoLdKd34++eecfFtiec/S1Y1UaZEeXLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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