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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109723d3f97e5d60fd55fff935f9b1612319be1909a3e6b8954a1af73836c878' 
  AND token = '6BgT453EJuGATFIo/DvME2P6y2CLE+qzyraaFVBMCLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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