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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2daa867ac238e8dc3e1efe66037dac732a14ab596455f290b0df7bc3688c14' 
  AND token = 'Thb/zRP8YMrDW9omdtG/NJhpeZU2m2ZadS6SegSpAZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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