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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0892a47cc9798b4f1fa827dba0a968e9457cf758fd4deb5d101f2155e725c2f3' 
  AND token = 'VtUUVOQjpaPhf8RP7c37RNKDn4KRs2o87ZJLNsPjcxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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