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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f9921aefb60835ca4cdce0cfa734dac4b3b53ea25b9e8dd6770f9e1ac2463c' 
  AND token = 'lUic/yZKUnD9TcGxEycCsNN/vi7gNVuSPgLMAlMDmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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