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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e0202aa310192f4ed76f268e89c7671aec3d21ac95834e4d997ae695df18f' 
  AND token = '2dCME4i+aTW4ZFiYvsL9vV2FsGvuxNl2LWn4M88nYDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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