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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1055f6a9266867d5e599a1bef571ea9754d752a519f4f19b250a9d4fba3d88' 
  AND token = 'mBg2ZXXMsJZLC51MSjVZ8N1gwpNuP/5NbI0KO5wnXPc=' 
  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"
    }
  }
}