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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184caa9a1792e73f11410d81140bca49f2c86a42655d00c2b5ac1c68edc4911c' 
  AND token = 'RE2S2tvB2jMEDh/RU/6hVLCBb/DQnNgrFJLemKPx2yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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