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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260d7d38ca1d2e0d575f17f4f9df54e152bb24fbc980de9c23340bf8ca85c0a4' 
  AND token = 'YU+0eaDNh3/2fkRpt2OYNUlWplCDkzqFdOfGpWZY42w=' 
  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"
    }
  }
}