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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc169dcd384153ea18756b6c4620fd403e83f55adfc9c5aa7bd139a68f22c46' 
  AND token = 'LmawOXXTAkQrP1u0vaRvhUl/03T/OWnYm9cQWIKio64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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