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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b60d17e9ba9ff2bdc1c52497e543a05f4e49962a44c3595795f0f62d7011a' 
  AND token = 'xIypgr2+nPZTaqDsZO/F//PD0fsJXEdrPJLFlyIIX1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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